do not add second interaction

examples/pinch-zoom.js

@@ -2,13 +2,8 @@ import Map from '../src/ol/Map.js';
 import OSM from '../src/ol/source/OSM.js';
 import TileLayer from '../src/ol/layer/Tile.js';
 import View from '../src/ol/View.js';
-import {
-  PinchZoom,
-  defaults as defaultInteractions,
-} from '../src/ol/interaction.js';
 
 const map = new Map({
-  interactions: defaultInteractions().extend([new PinchZoom()]),
   layers: [
     new TileLayer({
       source: new OSM(),